Answer:
The lining in the womb becomes thicker and spongy to protect the embryo/foetus in all stages of life inside the womb and to stop damage/harm coming to it
Explanation:
"A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. ... Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems."
Convergent evolution would be the best way to explain why two species that look similar are not necessarily that closely related. In convergent evolution, distinct species develop similar anatomical characteristics after its divergence from one common ancestor that does not possess the initial characteristic.
A quick Google search revealed that Andrew Johnson was the 17th president of the United States.
It shows that a scientist can be creative because they used the fish's coughing technique to search for contaminated water.